Having a varied diet DEFINITELY speeds things up.
My betta fry started to develop color on the edges of their fins around 1.5cm long.
I also have one, that's 1.5cm & has a angelic white coloration on it's body, but it's ventrals are red.
I'm not sure what foods you're providing..... but this is a list of some of the tiny critters mine have eaten since day one.
- water fleas,
- finely minced dragonfly larvae,
- 3-5 different types of aquatic worms,
- snails that they hunt themselves,
- mosquito larvae,
- dozen or more near microscopic things, I haven't identified.
In the past week, they've FINALLY decided to eat the typical commercial fish food which is phenomenal. Thanks to the adventurous larger siblings, the little bettas have learned by watching the others gorge themselves that the various bits floating on the surface are completely edible.
- Those of you that own baby bettas, measure their growth weekly by the centimeter or millimeter if you want to be more precise.